What’s Vulnerable › Vulnerabilities

CVE-2024-42483: ESP-NOW Replay Attacks Vulnerability

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-09-12 · updated 2026-06-17
• Weakness: CWE-349

Description

ESP-NOW Component provides a connectionless Wi-Fi communication protocol. An replay attacks vulnerability was discovered in the implementation of the ESP-NOW because the caches is not differentiated by message types, it is a single, shared resource for all kinds of messages, whether they are broadcast or unicast, and regardless of whether they are ciphertext or plaintext. This can result an attacker to clear the cache of its legitimate entries, there by creating an opportunity to re-inject previously captured packets. This vulnerability is fixed in 2.5.2.

Affected products

• espressif esp-now: before 2.5.2 — fixed in 2.5.2

How to fix

Upgrade to a fixed version: espressif esp-now 2.5.2. Check the vendor advisory for mitigations.

References

• https://github.com/espressif/esp-now/commit/4e30db50d541b2909d278ef0db05de1a3d7190ef
• https://github.com/espressif/esp-now/security/advisories/GHSA-wf6q-c2xr-77xj

Get alerted when CVE-2024-42483 or the next vulnerability affects your stack